linux-kernel - Re: [PATCH] powerpc: include linux/backlight.h from asm/backlight.h

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Date: Mon, 4 Mar 2024 18:13:01 +0000
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Thomas Zimmermann <tzimmermann@...e.de>, Jani Nikula
	<jani.nikula@...el.com>, Michael Ellerman <mpe@...erman.id.au>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
CC: "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>, Helge Deller
	<deller@....de>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "lkft-triage@...ts.linaro.org"
	<lkft-triage@...ts.linaro.org>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, Naresh Kamboju <naresh.kamboju@...aro.org>
Subject: Re: [PATCH] powerpc: include linux/backlight.h from asm/backlight.h



Le 04/03/2024 à 11:32, Thomas Zimmermann a écrit :
> Hi
> 
> Am 04.03.24 um 10:55 schrieb Jani Nikula:
>> Removal of the backlight include from fb.h uncovered an implicit
>> dependency in powerpc asm/backlight.h. Add the explicit include.
>>
>> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
>> Closes: 
>> https://lore.kernel.org/r/CA+G9fYsAk5TbqqxFC2W4oHLGA0CbTHMxbeq8QayFXTU75YiueA@mail.gmail.com
>> Fixes: 11b4eedfc87d ("fbdev: Do not include <linux/backlight.h> in 
>> header")
>> Cc: Thomas Zimmermann <tzimmermann@...e.de>
>> Cc: Helge Deller <deller@....de>
>> Cc: linux-fbdev@...r.kernel.org
>> Signed-off-by: Jani Nikula <jani.nikula@...el.com>
>>
>> ---
>>
>> Not even compile tested!
> 
> That's one of the cases that's hard to catch unless you get the config 
> right.
> 
>> ---
>>   arch/powerpc/include/asm/backlight.h | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/powerpc/include/asm/backlight.h 
>> b/arch/powerpc/include/asm/backlight.h
>> index 1b5eab62ed04..275d5bb9aa04 100644
>> --- a/arch/powerpc/include/asm/backlight.h
>> +++ b/arch/powerpc/include/asm/backlight.h
>> @@ -10,6 +10,7 @@
>>   #define __ASM_POWERPC_BACKLIGHT_H
>>   #ifdef __KERNEL__
>> +#include <linux/backlight.h>
> 
> Thanks, but I think this should go directly into chipsfb.c. I would have 
> provided a patch already, if our mail server didn't have issues this 
> morning. Let me try again.

asm/backlight.h needs it for struct backlight_device

At least if you don't want to include linux/backlight.h in 
asm/backlight.h, then you need a forward declaration of struct 
backlight_device;

> 
> Best regards
> Thomas
> 
>>   #include <linux/fb.h>
>>   #include <linux/mutex.h>
>